THE EFFECT OF BULL GENOTYPE ON THE POTENTIAL FOR GROWTH AND DEVELOPMENT OF OFFSPRING

Abstract

The results of studies on the comparative assessment of the daughters of 9 producing bulls of different genotypes from birth to 15 months of age under the same conditions of feeding and keeping in the Rial-Agro LLC breeding farm, one of the major milk producers, are presented. The generally accepted system for planning the growth and development of repair heifers, with the exception of the dairy period, where different options are possible, is based on a unified approach to obtaining an average daily increase in the range of 600 - 800 g or more, depending on the availability of feed and the age of insemination. However, according to the results of our research, the same level of feeding does not ensure the realization of the potential for growth and development of different genotypes. Intensification of the industry requires a reduction in the growth period of repair heifers. At this stage, calving at the age of two years has become the norm, respectively, 14-15 months - the age of fruitful insemination. The age features and influence on the intensity of growth and development of a number of factors indicating the staging of this process and the possibility of influencing the intensity of growth and development to increase the efficiency of growing repair heifers are established.